The new roof now needs to be connected by nailing through the board into the joists.
How to tie a roof into a trussed roof.
Joist hangers can help you mount each rafter to the house.
They form an upside down v with the point at the top of the addition roof.
Attach the horizontal beam by using a nail gun.
Cut two rafters with a circular saw to the pitch of the addition roof and nail them across the rafters on the old roof.
You have to do it thoroughly so that the rafters sit flush on it.
After that to make it flush with the roof of the existing house cut the two outer rafters.
After the ridge is cut to the correct angle and length it s nailed into place.
Up from the valley center and cut through the shingles and underlayment.
The positioning of your rafters will depend on the pitch of the porch roof.
This is important to minimize the chance of any water being able to penetrate the gap.
Step 3 connecting the new roof.
To scribe the roof angle on the ridge a length of stock is leveled over from the common rafters and a 2 by scrap is set against the sleepers.
The easiest way to tie in the new shingles with the old is with a cut valley see four ways to shingle a valley.
This is an important job and needs to be done.
The roofing cement will resist possible leaks overnight.
If you decide on a shallow pitch porch roof use 2 by 6 foot rafters.
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Make a cutting on one of the sides of the horizontal roof beam on an angle.
Use screws to secure the rafter to the sill plate.